loop0: detected capacity change from 0 to 32768
syz_tun: entered allmulticast mode
BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:663!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5343 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 1e d2 61 fe 48 c7 c7 e0 1b 0c 8c 48 c7 c6 d9 17 0c 8c ba 97 02 00 00 48 c7 c1 00 1d 0c 8c e8 df b2 c3 fd 90 <0f> 0b e8 f7 d1 61 fe 48 c7 c7 c0 1d 0c 8c e8 cb b2 c3 fd 48 c7 c7
RSP: 0018:ffffc9000e26de00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 9529e1cf60402000
RDX: ffffc9000ed92000 RSI: 00000000000744a3 RDI: 00000000000744a4
RBP: ffffc9000e26df28 R08: ffffc9000e26db87 R09: 1ffff92001c4db70
R10: dffffc0000000000 R11: fffff52001c4db71 R12: 1ffff9200020fc00
R13: ffffc9000107e000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0737c886c0(0000) GS:ffff88808c809000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec6af0f04 CR3: 0000000043cc6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1257
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc95/0x1020 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x358/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2035
 block_write_begin+0x8d/0x120 fs/buffer.c:2146
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4468
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1378
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
 coredump_write+0x1216/0x1910 fs/coredump.c:1053
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x3807/0x4530 fs/coredump.c:1206
 get_signal+0x1107/0x1330 kernel/signal.c:3022
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0736d9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0737c87fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffe5 RBX: 00007f0737015fa0 RCX: 00007f0736d9c819
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f0736e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000484043000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0737016038 R14: 00007f0737015fa0 R15: 00007ffec6aef938
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 1e d2 61 fe 48 c7 c7 e0 1b 0c 8c 48 c7 c6 d9 17 0c 8c ba 97 02 00 00 48 c7 c1 00 1d 0c 8c e8 df b2 c3 fd 90 <0f> 0b e8 f7 d1 61 fe 48 c7 c7 c0 1d 0c 8c e8 cb b2 c3 fd 48 c7 c7
RSP: 0018:ffffc9000e26de00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 9529e1cf60402000
RDX: ffffc9000ed92000 RSI: 00000000000744a3 RDI: 00000000000744a4
RBP: ffffc9000e26df28 R08: ffffc9000e26db87 R09: 1ffff92001c4db70
R10: dffffc0000000000 R11: fffff52001c4db71 R12: 1ffff9200020fc00
R13: ffffc9000107e000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0737c886c0(0000) GS:ffff88808c809000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec6af0f04 CR3: 0000000043cc6000 CR4: 0000000000352ef0